Rewrote box-shadow mixin for sass 3.1.1+
Rewrote box-shadow mixin for sass 3.1.1+

nickg33/bourbon,openeducation/bourbon,mindeavor/bourbon,openeducation/bourbon,zyj1022/bourbon,greyhwndz/bourbon,zyj1022/bourbon,cllns/bourbon,jasonwalkow/bourbon,craftsmen/bourbon,jamadam/bourbon-docs-jp,setie/bourbon,jamesmenera/bourbon-libsass,Jazz-Man/bourbon,jamesmenera/bourbon-libsass,smithdamen/bourbon,Nikeshsuwal/bourbon,jamadam/bourbon-docs-jp,chriseppstein/bourbon,thoughtbot/bourbon,ismarkunc/bourbon,jamadam/bourbon-docs-jp,setie/bourbon,mindeavor/bourbon,san650/bourbon,nagyistoce/sass-bourbon.io,thoughtbot/bourbon,jamadam/bourbon-docs-jp,nickg33/bourbon,greyhwndz/bourbon,jasonwalkow/bourbon,craftsmen/bourbon,chriseppstein/bourbon,smithdamen/bourbon,Jazz-Man/bourbon